/*
    This source file is part of GeNa project.
    Copyright © GeNa project 2008
    For the latest info, see http://code.google.com/p/genaproject/ or  http://lumpyproject.forums-rpg.com

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    Foobar is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Foobar.  If not, see <http://www.gnu.org/licenses/>. */

#ifndef MISC_GENERIC_HPP_INCLUDED
#define MISC_GENERIC_HPP_INCLUDED

#include <boost/mpl/always.hpp>
#include <boost/typeof/typeof.hpp>

#define IF_THIS_VARIABLE_EXIST_THEN_ELSE( classname, variable, adaptator, then_do, else_do) \
template<class T, class U = void> class classname \
{ \
public: \
    adaptator apply; \
    \
    classname() \
    { \
        apply = then_do; \
    } \
}; \
 \
template<class T> class classname<T, typename boost::mpl::always<void>::apply<BOOST_TYPEOF_TPL( &T::variable)>::type > \
{ \
public: \
    adaptator apply; \
    \
    classname() \
    { \
        apply = else_do; \
    } \
};

#endif // MISC_GENERIC_HPP_INCLUDED
